Old pics, but you'll get the point. (ditched all plastic for brass)
This is my 'making best use out of small spaces' approach.
We are very ladder heavy crews, so there is usually about 8 pieces of ladder back there.
The worst part was, I ordered the inline TDS meter, after I build the plank and wheelwell cover. [see left side]
(the connections sold here were so small, I think they are meant for a squirt gun)
But I can slam ladders and whatever else, without ever touching any fragile connections.